Generally you should get the numbers from the Restore menu (if you’re guessing based on the log history).
Also, despite the cited post, the manual says the base version is the first number, so if you want old to new, higher number is on top because it’s older. Lower number is second row, and 0 is always the latest version.
That’s getting a bit ahead, as original post had intended dates but no differences so ordering doesn’t matter.
A Google search for “duplicati” “compare” “Size of backup * 0 bytes” found the following explanation for that:
so maybe see if removing excludes gets you a non-zero size (and hopefully also a comparison of the files).